CN113938660A

CN113938660A - Display device

Info

Publication number: CN113938660A
Application number: CN202111076028.XA
Authority: CN
Inventors: 余新; 胡飞; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-03-16
Filing date: 2018-03-16
Publication date: 2022-01-14
Anticipated expiration: 2038-03-16
Also published as: CN110278423B; US20210136337A1; WO2019174270A1; US11343476B2; CN113938660B; CN110278423A

Abstract

A display device, characterized in that the display device comprises a light source arrangement comprising a first light source for emitting a first light and a second light source for emitting a second light; the first light includes first, second, and third color lights, the second light includes first and second color lights; the light modulation device comprises a first spatial light modulator, a second spatial light modulator and a third spatial light modulator, and the spatial light modulators are used for modulating the first color light, the second color light and the third color light in different time periods. The color gamut range of the display device can be improved.

Description

Display device

The application is based on divisional application with application date of 2018, 3, month and 16, application number of 201810219946.5 and invention name of 'display equipment'.

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

The color gamut generally refers to the spectrum locus of visible light that can be seen by human eyes in nature, and the area of the region formed by the visible spectrum locus is the maximum color gamut area that can be seen by human eyes. At present, display pens such as projectors and displays which are composed of different display devices adopt R, G, B three-primary-color display equipment to reproduce images in a color recovery mode. In a given chromaticity space, such as CIE1931xy chromaticity space, the triangle formed by the R, G, B three primary colors of a display device is called the color gamut which can be displayed by the device, and the larger the color gamut space area is, the more vivid and vivid the color picture is, however, how to make the display device realize the display of wider color gamut is an important technical subject in the industry.

Disclosure of Invention

In view of the above, the present invention provides a display device that can realize a wider color gamut.

A display device, characterized in that the display device comprises:

a light source device including a first light source for emitting a first light and a second light source for emitting a second light; the first light includes first, second, and third color lights, the second light includes first and second color lights;

a light modulation device comprising a first spatial light modulator, a second spatial light modulator, and a third spatial light modulator, wherein:

at a first time period t1, the first spatial light modulator modulates a first color of the first light, the second spatial light modulator modulates a second color of the first light, and the third spatial light modulator modulates a third color of the first light;

at a second time period t2, the first spatial light modulator modulates a first color light of the second light, the second spatial light modulator modulates a second color light of the second light, and the third spatial light modulator modulates a third color light of the first light.

In one embodiment, the main wavelength ranges of the first color light, the second color light and the third color light do not overlap with each other.

In an embodiment, the display device further comprises an image data processing module for receiving an original image signal of the display image and outputting correction control signal values for the first and second lights based on the image gamut range.

In one embodiment, the correction control signal value includes a correction control signal value of a first color light corresponding to the first light, a correction control signal value of a second color light corresponding to the first light, a control signal value of a third color light corresponding to the first light, a correction control signal value of a first color light corresponding to the second light, and a correction control signal value of a second color light corresponding to the second light.

In an embodiment, the first time period t1 is less than the second time period t 2.

In one embodiment, the first light source includes an excitation light source that emits excitation light and a wavelength conversion device that has a fluorescent material and is configured to receive the excitation light and emit fluorescence, the first light includes fluorescence, the second light source includes a laser light source, and the second light includes laser light.

In one embodiment, the excitation light source is a laser light source, the excitation light is a blue laser, the wavelength conversion device is configured to receive the excitation light and convert a part of the excitation light into the fluorescence, and use another part of the excitation light and the fluorescence as the first light, the another part of the excitation light is a third color light of the first light, the fluorescence includes red light and green light, the red light of the fluorescence is the first color light of the first light, and the green light of the fluorescence is the second color light of the first light; the second light source comprises a red laser light source and a green laser light source, the second light comprises a red laser and a green laser, the red laser is a first color light of the second light, and the green laser is a second color light of the second light.

In one embodiment, the wavelength conversion device includes a fluorescent region and a scattering region having a fluorescent material, the fluorescent region and the scattering region are arranged along a circumferential direction, the scattering region receives the excitation light, the red laser light and the green laser light in a first period and scatters the excitation light, the red laser light and the green laser light to emit light, the fluorescent region receives the excitation light in a second period and converts a first part of light in the excitation light into the fluorescent light and emits a second part of light in the excitation light and the fluorescent light, and the excitation light in the first period and the second part of light in the second period are collectively used as a third color light of the first light.

In one embodiment, the display device further includes a first light splitting element and a second light splitting element, the first light splitting element receives the first light and the second light emitted by the light source device and splits the first color light and the second color light and a third color light, the first color light is guided to the first spatial light modulator, and the second color light and the third color light are guided to the second light splitting element; the second light splitting element directs the second color light to the second spatial light modulator and directs the third color light to the third spatial light modulator.

In an embodiment, the light source device further includes a first light combining element, a second light combining element, and a light splitting and combining element, the first light combining element combines the excitation light emitted from the excitation light source with one of the red laser light and the green laser light, the second light combining element is configured to combine the light emitted from the first light combining element with the other one of the red laser light and the green laser light and guide the combined excitation light, the red laser light, and the green laser light to the wavelength conversion device through the light splitting and combining element, and the first light and the second light emitted from the wavelength conversion device are further provided to the spatial light modulator through the light splitting and combining element.

Compared with the prior art, in the display device, the second light is added, the original image data of the image is converted into the correction control signal values respectively corresponding to the first light and the second light, and the first light and the second light are modulated according to the correction control signal values to obtain the image light, so that the display of the image data with the wide color gamut can be realized, the accurate reduction of the displayed image can be ensured, and the display device has the advantages of wide color gamut and better display effect. In addition, the three spatial light modulators modulate light in different wavelength ranges, and the three spatial light modulators can work simultaneously, so that the image modulation time is reduced, the three spatial light modulators can work in a wavelength light splitting mode, and the display equipment is relatively practical.

Drawings

Fig. 1 is a comparison diagram of the gamut ranges of several display devices using different light sources.

Fig. 2 is a schematic view of a light source structure of a display device.

Fig. 3 is a schematic view of a light source structure of another display device.

Fig. 4a and 4b are schematic diagrams of color gamut ranges of the display devices shown in fig. 2 and 3 with different proportions of pure color lasers.

Fig. 5a and 5b are schematic diagrams of the gamut ranges achieved in a display device using dynamic gamut.

FIG. 6 is a block diagram of a display device according to a preferred embodiment of the present invention.

Fig. 7 is a color gamut range diagram of the display device shown in fig. 6.

Fig. 8 is a modulation timing diagram for three spatial light modulators of the display device of fig. 6.

Fig. 9 is a partial detailed structural diagram of the display device shown in fig. 6.

Fig. 10 is a schematic plan view of the light splitting and combining element shown in fig. 9.

Fig. 11 is a schematic optical path diagram of the optical splitting and combining element shown in fig. 9 during operation.

Fig. 12 is a schematic view of the structure of the wavelength conversion device shown in fig. 9.

FIG. 13 is a schematic illustration of the technical gamut and color volume expansion of the display device shown in FIG. 6.

Description of the main elements

Display device 600

Light source device 610

Image data processing module 620

Light modulating device 630

First light source 611

Second light source 612

Excitation light source 613

Wavelength conversion device 614

Laser light sources

615, 616

First light combining element 617a

Second light-combining element 617b

Light splitting and combining element 617c

First light splitting element 618a

Second beam splitting element 618b

Guide element 618c

First region 617d

Second region 617e

Phosphor region 614a

Scattering region 614b

First spatial light modulator 631

Second spatial light modulator 632

Third spatial light modulator 633

Image synthesizing apparatus 640

First gamut F1

Second gamut F2

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Light sources of display devices such as laser projectors are generally classified into three major categories, one of which is to excite phosphors of different colors by short-wavelength laser to generate primary colors of red, green and blue. Another type directly utilizes red, green and blue lasers as the three primary color light sources. The third is the combination of the first two, and a general blue laser light source is used as an excitation light source with short wavelength to excite the fluorescent powder to generate red-green primary color light and also used as blue primary color light. Each of these three different implementation techniques has advantages and disadvantages. For the scheme of exciting the fluorescent powder or mixing the laser fluorescence by the laser, because the semiconductor blue laser with the gallium nitride substrate has the characteristics of high efficiency, long service life and stable work, the scheme of exciting the fluorescent powder color wheel by the blue semiconductor laser has the characteristics of long service life, high efficiency, stable equipment and low cost. However, the relatively narrow color gamut of this approach is due to the broad spectrum of phosphor-excited fluorescence (Laser phosphor). Generally, a display device using the technology can cover the complete sRGB color gamut, and the color gamut can be enhanced to reach the DCI-P3 color gamut by some enhancement processing, such as adding a narrow-band optical filter to remove the yellow light spectrum in the green light and the red light. But the narrow-band filtering loses considerable luminance of the light, so that the efficiency of the display device is greatly reduced. A display device using pure RGB lasers has a very wide color gamut because RGB lasers have very good monochromaticity. A display device (e.g., a projection system) using RGB lasers can easily meet the REC2020 color gamut standard, and please refer to fig. 1 for a comparison of the color gamuts of the display devices.

However, RGB laser display devices (such as projectors) also have a number of disadvantages. The first is speckle. Speckle is caused by the coherence of laser light, and the light reflected on a display plane interferes due to a phase difference caused by the fluctuation of the plane, resulting in uneven brightness distribution on the display screen. Although there have been many inventions that attempt to solve the problem of laser speckle, none are ideal. Secondly, the cost of the RGB laser display device is high. This is because the red and green lasers in RGB laser display devices are not mature under the current technology. The efficiency of semiconductor green laser can only be below 20%, which is far lower than blue laser of gallium nitride substrate and red laser of ternary substrate, and the cost is very high. While the red laser has almost the same efficiency as the blue laser, the red laser has poor temperature stability, and not only the efficiency is significantly reduced with the increase of temperature, but also the center wavelength is shifted. The two points make the RGB laser display device have color cast along with temperature change. This requires a thermostat for the red laser to stabilize the operating state of the red laser, which means a powerful cooling device is required to ensure the operating temperature of the red laser to be stable, thereby greatly increasing the cost of the RGB laser display device.

A basic laser light source 200 for exciting a phosphor wheel is shown in fig. 2. a short wavelength visible light from an excitation light source 210 excites the phosphor on a color wheel 220 to produce a time sequential primary or white light. The wide spectrum of fluorescence makes the gamut coverage based on this system relatively narrow. An improved method of enhancing the color gamut is shown in fig. 3. The short wavelength visible light emitted from the excitation light source 310 is converted into primary light by the color wheel 320 and filtered by the synchronization filter 330 to obtain primary light with higher narrow band color purity to expand the color gamut of the laser fluorescence. The filter device causes additional optical power loss and reduces the efficiency of the display device.

The color gamut of the light source can be expanded by doping pure red and green laser into laser fluorescence. The implementation scheme of the laser fluorescence system can be used for mixing a pure color laser as proposed in one technology, and the implementation scheme of the optical path for mixing one or two mentioned in another technology, and the like. Although the color gamut of laser fluorescence can be expanded by doping pure-color laser, the color gamut which can be enhanced by the pure-color laser is limited due to no modulation of the light source ratio according to the display content. As shown in fig. 4, on the basis of the mixed light (mix gamit) added with the pure color laser with 20% fluorescence brightness (as shown in fig. 4 a), if the color gamut of the laser fluorescence needs to be expanded to the DCI-P3 standard, the mixed light is formed by adding the pure color laser with 40% fluorescence brightness (as shown in fig. 4 b). The display device of this scheme is more efficient than the phosphor plus filter scheme, but the need to add a powerful red-green laser leads to increased system cost.

In addition, a display device using a dynamic color gamut, which dynamically adjusts the brightness of laser light and fluorescence by analyzing an image, can also increase system efficiency. Because the picture always has certain brightness, and the fluorescence and the laser are combined in front of the spatial light modulator to form a three-primary-color system, wherein the blue primary color is from a blue laser, the green primary color is from the light combination of the green fluorescence and the green laser according to the proportion given by the dynamic control signal, and the red primary color is from the light combination of the red fluorescence and the red laser according to the proportion. Since the maximum brightness of the picture is usually not zero, and the intensity of the fluorescence is set according to the maximum brightness of the picture, and the bright field information of the picture usually has a large amount of white light components, the brightness of the fluorescence cannot be completely turned off by the dynamic color gamut method, so that the color gamut of the dynamic color gamut method cannot completely reach the color gamut of the rec.2020 standard, please refer to fig. 5, fig. 5 is a schematic diagram of the color gamut range which can be reached by the display device adopting the dynamic color gamut, wherein fig. 5a is a schematic diagram of the color gamut range which can be reached by doping 20% of red laser and green laser into the fluorescence, and fig. 5b is a schematic diagram of the color gamut range which can be reached by doping 40% of red laser and green laser into the fluorescence, as can be seen, fig. 5a and 5b are both difficult to completely reach the color gamut of the rec.2020 standard.

Referring to fig. 6, fig. 6 is a block diagram of a display device 600 according to a preferred embodiment of the invention. The display apparatus 600 includes a light source device 610, an image data processing module 620, a light modulation device 630, and an image synthesis device 640.

The light source device 610 is configured to emit a first light and a second light, the first light is used for modulating an image in a first color gamut F1, the second light is used for jointly modulating an image out of the first color gamut F1 with the first light, the first light includes m color lights, the second light includes n color lights of the m color lights, and m is greater than or equal to n. Specifically, the first light may also include fluorescence, m may be 3, and the first light includes three primary colors of light, such as red, green and blue, where in the first light, the blue light may be laser light, and the green light and the red light are both fluorescence, and the fluorescence may be generated by exciting a fluorescent material (such as a red fluorescent material and a green fluorescent material, or a yellow fluorescent material) with a blue laser. The second light may include red light and green light, both of which may be laser light, i.e., n may be 2, and the two color lights of the second light may be red laser light and green laser light, respectively.

It is understood that, as mentioned above, the gamut range that the first light can exhibit is the first gamut range F1, as shown in fig. 7, the first gamut range F1 can be a DCI gamut range, such as the gamut range DCI-P3, so if the image to be displayed is an image of the first gamut range F1, the second light can be 0, and only the first light is modulated to exhibit the image of the first gamut range F1. Further, in the first light, since the red light and the green light are fluorescent light, and the second light includes a red laser and a green laser, the laser light of the second light can exhibit a wider color gamut than the fluorescence light in the first light, and in particular, the first light and the second light may together exhibit an image outside the first color gamut, and, in particular, an image having a color gamut on the boundary line of the second color gamut range F2 can be displayed by modulating the blue laser light in the first light and the red-green laser light in the second light (in this case, the red-green fluorescence in the first light can be 0), wherein the second gamut range F2 covers the first gamut range F1 and has a portion outside the first gamut range F1, the second gamut range F2 may be an REC gamut range, such as gamut range rec.2020; further, for an image whose color gamut is located on a boundary line of the first color gamut range F1 and a boundary line of the second color gamut range F2, the image may be exhibited by modulating blue laser light, red-green fluorescence light in the first light and red-green laser light in the second light together, and the blue laser light, the red-green fluorescence light in the first light and the red-green laser light in the second light may not be all 0.

The image data processing module 620 is configured to receive original image data of an image to be displayed, where the original image data of the image to be displayed is based on the image data of the second color gamut F2 and includes original control signal values of m colors for each pixel, and the image data processing module 620 is further configured to map the original control signal values of m colors for each pixel of the original image data of the image to be displayed to corrected control signal values of m + n colors, so as to obtain corrected image data of the image to be displayed. Specifically, in the corrected image data, the m + n color correction control signal values of each pixel include m correction control signal values corresponding to the first light and n correction control signal values corresponding to the second light.

First, it can be understood that the raw image data may adopt different encoding formats such as RGB encoding and YUV encoding, wherein different encoding formats may correspond to different color spaces, in this embodiment, the raw image data is mainly converted into tristimulus values X, Y, Z of a color space defined by xyz color gamut coordinates in the CIE 1937 standard to calculate the correction control signal values, specifically, CIE 1937 defines absolute colors and luminances of colors that can be resolved by any human eye in a three-dimensional vector, which are not transformed with the transformation of the color gamut, so that the principle that the tristimulus value X, Y, Z of the pixel calculated from the raw control signal value of the pixel is equal to the tristimulus value X, Y, Z of the pixel calculated from the first correction control signal value and the second correction control signal value of the pixel, and calculating a corresponding first correction control signal value and a corresponding second correction control signal value according to the original control signal value of each pixel.

For example, assuming that the original control signal values of m colors of each pixel are R, G, B, the m correction control signal values are r, g, b, and the n correction control signal values are rl, gl, based on the principle that the tristimulus values X, Y, Z of the pixel calculated from the original control signal value R, G, B of the pixel are equal to the tristimulus values X, Y, Z of the pixel calculated from the correction control signal values r, g, b, rl, gl of the pixel, the image data processing module maps the original control signal values R, G, B of each color of the original image data of the image to the correction control signal values r, g, b, rl, gl of m + n colors to obtain the corrected image data of the image to be displayed.

Wherein, in the mapping process of converting the original control signal value R, G, B into the corrected control signal values r, g, b, rl, gl, the original control signal value R, G, B is known, and countless numbers of mapping formulas of tristimulus values can be obtainedThe solution of r, g, b, rl, gl is determined, and rl is selected based on the maximum gray scale range of 0 to M that can be displayed by the display device²+gl²The minimum values of r, g, b, rl, gl are used as the correction control signal values r, g, b, rl, gl, so that the most suitable values of r, g, b, rl, gl can be obtained. At the same time, due to the rl²+gl²And the second light is minimum, so that the rl and the gl corresponding to the second light are ensured to be small, the display of the color gamut of the image is realized by using the minimum second light, the image is accurately restored, the use of the second light can be reduced, and the cost of a light source is reduced.

In the following, how to obtain the corresponding correction control signal values r, g, b, rl, and gl according to the original control signal values of m colors of each pixel being R, G, B when the original image data is in the RGB encoding format will be described in detail. Specifically, when the original image data is image data in an RGB encoding format, and the m colors are three primary colors of red, green and blue, the original control signal value R, G, B is a red original gray-scale value R, a green original gray-scale value G and a blue original gray-scale value B, the first correction control signal values R, G and B are a red first correction gray-scale value R corresponding to red fluorescence of the first light, a green first correction gray-scale value G corresponding to green fluorescence of the first light and a blue first correction gray-scale value B corresponding to blue laser of the first light, respectively, and the second correction control signal values rl and gl are a red second correction gray-scale value rl corresponding to red laser of the second light and a green second correction gray-scale value gl corresponding to green laser of the second light, respectively. Further, in the display device, the original gray scale value R, G, B and the corrected gray scale values r, g, b, rl, and gl may all adopt a binary coding format, for example, N-bit binary coding, the gray scale level M that each color of the display device can exhibit corresponds to the bit number N of the binary coding, that is, the original gray scale value R, G, B and the corrected gray scale values r, g, b, rl, and gl are all in the range of [ 0 to M ], where M =2^N-1. For example, when N =8, the gray scale level of the display device is 256, and the original gray scale value R, G, BAnd the corrected gray scale values r, g, b, rl, gl are all in the range of [ 0 to 255 ], wherein a gray scale value of 0 represents that the color is completely turned off, and a gray scale value of 255 represents that the color is displayed with the highest brightness.

Further, the three primary colors of RGB are different according to the color gamut of the original image data. In this embodiment, the original image data is image data in a second color gamut F2, and the three primary colors r in the second color gamut F2 are assumed to be₀、g₀、b₀Satisfies the following formula 1 at the xyz color gamut coordinate in the CIE 1937 color space.

(formula 1)

It will be appreciated that the second gamut range F2 is known for the original image data, and thus the r₀、g₀、b₀Also known are the xyz color gamut coordinates of. When the second gamut range is the REC2020 gamut range, the r₀、g₀、b₀The xyz color gamut coordinates in the CIE 1937 color space are (0.708, 0.292, 0.2627), (0.17, 0.797, 0.6780), (0.131, 0.046, 0.0593), respectively.

Further, when tristimulus values (X, Y, Z) are calculated in the CIE 1937 color space by converting the original gray scale values (R, G, B) of the respective colors of each pixel, the tristimulus values (X, Y, Z) satisfy the following formula 2.

(formula 2)

Wherein, in formula 2, as mentioned above, M is the gray scale level of the display device. Further, three primary colors r according to said second gamut range₀、g₀、b₀The xyz color gamut coordinate (see equation 1) of (a), the matrix C satisfies equation 3 below.

(formula 3)

Further, since the display device of the present invention uses a five primary color system of m color lights of the first light and n color lights of the second light, the five primary colors are

And

respectively representing the color and brightness of red fluorescence in the first light, green fluorescence in the first light, blue laser in the first light, red laser in the second light and green laser in the second light, the five primary colors

And

the xyz color gamut coordinate in the CIE 1937 color space satisfies the following equation 4.

(formula 4)

It is understood that the brightness of any color in the CIE space can be obtained by combining the five primary colors modulated according to the brightness ratio

And

or may be known, as determined by the first light and the second light emitted by the light source device 610. Further, the principle that the tristimulus value X, Y, Z of the pixel calculated from the original gray-scale value R, G, B of each pixel is equal to the tristimulus value X, Y, Z of the pixel calculated from the first and second corrected gray-scale values r, g, b, rl, gl of the pixel, the corrected gray-scale values r, g, b, rl, gl being full ofIt suffices to use the following equation 5.

/M (formula 5)

Further, according to equation 4, the transformation matrix

The following equation 6 is satisfied.

(formula 6)

Since the tristimulus values X, Y, Z can be calculated from the original image data, the transformation matrix

Or according to five primary colors

And

the correction gray scale values r, g, b, rl, gl are obtained, and therefore have virtually infinite sets of solutions, according to the equation 5. To implement the correction gray-scale values r, g, b, rl, and gl corresponding to the only five primary colors, additional restrictions need to be added to solve the correction gray-scale values r, g, b, rl, and gl.

Specifically, in one embodiment, the brightness of two of the corrected gray scale values r, g, b, rl, gl may be randomly assigned, and the other three values may be evaluated. It should be noted that the value ranges of the five control signals are between 0 and 255, and two values selected randomly may cause the remaining three values to be out of the value range, so the method of random selection is not the most preferred embodiment. In another embodiment, the sum of the squares of the luminance of the red and green laser light may be minimized

Minimization, i.e. obtaining

。

First, we can transform equation (5) to equation 7 below.

(formula 7)

Wherein the parameter A, B satisfies the following equations 8 and 9, respectively.

(formula 8)

(formula 9)

Further, to solve r, g, b, rl, gl, the following equation 10 can be obtained by transforming equation 7.

(formula 10)

Further, the air conditioner is provided with a fan,

minimum, i.e. demand, solutions

That is to say need to solve

。

Defining functions

Wherein the function

(formula 11)

Further, to solve the function

Can be made to be partially differential

Minimum, i.e. partial differential of said r, g, b

。

(formula 12)

Further, by rewriting the matrix in equation 10, the following equation 13 can be obtained.

(formula 13)

The equation 12 can be rewritten as the following equation 14.

(formula 14)

Wherein, according to the formula 13, the parameters D and D respectively satisfy the following formula 15 and formula 16.

(formula 15)

(formula 16)

Equation 13 is obtained by matrix rewriting, since the parameter A, B can pass through the five primary colors of equation 4

And

the color gamut coordinate xyZ and the tristimulus values XYZ of equation 2 are obtained by calculation, so that the parameter T and its parameters T11, T12, T13, T14, T21, T22, T23, and T24 can be known, and the parameter numbers T11, T12, T13, T14, T21, T22, T23, and T24 are further substituted into equation 15 and equation 16 to obtain the values of the parameters D and D, thereby obtaining the first correction gray-scale values r, g, and b, and then substituting the values of r, g, and b into equation 7 to obtain the values of the second correction gray-scale values rl and gl. If the color brightness of the color exceeds the range which can be represented by the five-primary-color gamut, the gray-scale values of the five primary colors can have values beyond the range, and simple truncation is performed, specifically, the gray-scale values beyond M are replaced by M, and the gray-scale values below 0 are replaced by 0.

As can be seen from the above description, after the image data processing module 620 receives the raw image data of the image, the raw control signal values R, G, B of m colors of each pixel are converted into corresponding correction control signal values r, g, b, rl, gl, so as to obtain the corrected image data, and the image data processing module 620 further provides the corrected image data to the light modulation device 630.

The light modulation device 630 is configured to receive the corrected image data, and modulate the first light and the second light according to m + n corrected control signal values r, g, b, rl, and gl of each pixel of the corrected image data to obtain image light.

The light modulation device 630 includes a first spatial light modulator 631, a second spatial light modulator 632, and a third spatial light modulator 633. The m color lights of the first light and the n color lights of the second light are divided into lights of a first wavelength range, a second wavelength range and a third wavelength range, which have different wavelength ranges. The first wavelength range may be a wavelength range of red light, such as 620 and 750 nm. The second wavelength range may be a wavelength range of green light, such as 495-570 nm. The third wavelength range may be a wavelength range of blue light, such as 435nm-495 nm.

The first spatial light modulator 631 modulates the light of the first wavelength range (e.g., red light) according to the correction control signal value (e.g., r, rl) corresponding to the light of the first wavelength range to generate first image light, the second spatial light modulator 632 modulates the light of the second wavelength range (e.g., green light) according to the correction control signal value (e.g., g, gl) corresponding to the light of the second wavelength range to generate second image light, and the third spatial light modulator 633 modulates the light of the third wavelength range (e.g., blue light) according to the correction control signal value (e.g., b) corresponding to the light of the third wavelength range to generate third image light. The first image light, the second image light, and the third image light generated by the light modulation device 630 may be combined by the image combining device 640 to display the image. It is understood that the first spatial light modulator 631 and the second spatial light modulator 632 can be a DMD spatial light modulator, an Lcos spatial light modulator, an LCD spatial light modulator, and the like.

In one embodiment, the m may be 3, the n may be 2, the first light may include a first color light, a second color light and a third color light, the second light may include the first color light and the second color light, the correction control signal values may include a correction control signal value r corresponding to the first color light of the first light, a correction control signal value g corresponding to the second color light of the first light, a control signal value b corresponding to the third color light of the first light, a correction control signal value rl corresponding to the first color light of the second light and a correction control signal value gl corresponding to the second color light of the second light, and the first spatial light modulator 631 may modulate the first color light of the first light according to the correction control signal value r corresponding to the first color light of the first light and modulate the first color light of the second light according to the correction control signal value rl corresponding to the first color light of the second light Light to generate the first image light. The second spatial light modulator 632 is configured to modulate the second color light of the first light according to the correction control signal value g of the second color light corresponding to the first light, and modulate the second color light of the second light according to the correction control signal value gl of the second color light corresponding to the second light. The third spatial light modulator 633 is configured to modulate the third color light of the first light according to the correction control signal value b corresponding to the third color light of the first light to generate the second image light.

The first, second and third colors of light may be red, green and blue light in sequence, and the first, second and third colors of light of the first light are red fluorescence, green fluorescence and blue laser, respectively. The first color light and the second color light of the second light are respectively red laser and green laser.

Referring to fig. 8, fig. 8 is a modulation timing diagram of the three spatial

light modulators

631, 632, 633 of the display apparatus 600 of fig. 6. The modulation time T1 of the image is divided into a first time period T1 and a second time period T2, the first spatial light modulator 631 modulates the first color light of the second light during the first time period T1 and modulates the first color light of the first light during the second time period T2, the second spatial light modulator 631 modulates the second color light of the second light during the first time period T1 and modulates the first color light of the first light during the second time period T2, and the third spatial light modulator 633 modulates the third color light of the first light during the modulation time T1 of the image. In the present embodiment, the first time period t1 is less than the second time period t 2.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a light source device 610, a light modulation device 630 and an image synthesis device 640 of the display apparatus 600 shown in fig. 6. Specifically, in the embodiment shown in fig. 9, the light source device 610 includes a first light source 611, a second light source 612, a first light splitting element 618a, a second light splitting element 618b, a first light combining element 617a, a second light combining element 617b, and a light splitting and combining element 617 c. The first light splitting element 618a, the second light splitting element 618b, the first light combining element 617a, the second light combining element 617b, and the light splitting and combining element 617c may be wavelength light splitting/combining elements, such as wavelength light splitting/combining films.

The first light source 611 is configured to emit the first light, the second light source 612 is configured to emit the second light, the first light source 611 includes an excitation light source 613 and a wavelength conversion device 614, the excitation light source 613 emits excitation light, the wavelength conversion device 614 has a fluorescent material and is configured to receive the excitation light and emit the first light, the first light includes fluorescence, the second light source 612 includes a laser light source, and the second light includes laser light.

The excitation light source 613 is a laser light source, the excitation light is blue laser light, the wavelength conversion device 614 is configured to receive the excitation light and convert a part of the excitation light into the fluorescent light, and use another part of the excitation light and the fluorescent light as the first light, and the fluorescent light includes red light and green light; the second light source 612 includes a first laser light source 615 and a second laser light source 616, and the second light includes a first laser and a second laser, where the first laser is a red laser and the second laser is a green laser or the first laser is a green laser and the second laser is a red laser.

The first light combining element 617a combines the excitation light emitted from the excitation light source with one of the red laser light and the green laser light, and the second light combining element 617b is configured to combine the light emitted from the first light combining element 617a with the other of the red laser light and the green laser light and guide the combined excitation light, red laser light, and green laser light to the wavelength conversion device via the light splitting and combining element 617 c.

The first light splitting element 617c receives the first light and the second light emitted from the second light combining element 617b and splits the light in the first wavelength range and the light in the second and third wavelength ranges, the light in the first wavelength range is guided to the first spatial light modulator 631, the light in the second and third wavelength ranges is guided to the second light splitting element 618b, the light in the second wavelength range is guided to the second spatial light modulator 632, and the light in the third wavelength range is guided to the third spatial light modulator 633.

Further, referring to fig. 10, fig. 11 and fig. 12, fig. 10 is a schematic plan view of the light splitting and combining element 617c, fig. 11 is a schematic optical path diagram of the light splitting and combining element 617c during operation, and fig. 12 is a schematic structural diagram of the wavelength conversion device 614. In this embodiment, the light splitting/combining element 617c includes a first region 617d and a second region 617 e. The first region 617d receives the excitation light, the first laser light, and the second laser light emitted by the second light combining element 617b and transmits the excitation light, the first laser light, and the second laser light to the wavelength conversion device 614. The first region 617d is located at the center of the second region 617 e. A lens may be further disposed between the wavelength conversion device 614 and the light splitting and combining element, and is configured to collimate the light emitted by the wavelength conversion device 614.

The wavelength conversion device 614 includes a fluorescent region 614a and a scattering region 614b having a fluorescent material, the fluorescent region 614a and the scattering region 614b are arranged along a circumferential direction, the scattering region receives the excitation light, the red laser light and the green laser light and scatters the excitation light, the red laser light and the green laser light for a first period t1 to emit the excitation light, the fluorescent region 614a receives the excitation light for a second period t2 and converts a first part of the excitation light into the fluorescence light and emits a second part of the excitation light and the fluorescence light, and the excitation light for the first period t1 and the second part of the second period are used together as a third color light of the first light.

The time of one rotation of the wavelength conversion device 614 is the modulation time T1 of the picture, during a first time period t1, the excitation light source 613, the first laser light source 615 and the second laser light source 616 are turned on, the excitation light, the first laser light, and the second laser light are directed to the scattering region 614b, the scattering region 614b reflects the excitation light, the first laser light, and the second laser light to the second region 617e, the second region 617e reflects the excitation light, the first laser light, and the second laser light to the first light splitting element 618a, the first light splitting element 618a splits the excitation light and the first and second laser beams, thereby guiding the first laser light to the first spatial light modulator 631 via the guiding element 618c and guiding the second laser light and the excitation light to the second light splitting element 618 b. The second light splitting element 618b further splits the second laser light and the excitation light, and supplies the second laser light to the second spatial light modulator 632, and supplies the excitation light to the third spatial light modulator 633 via the guiding element 618 c.

In a second time period t2, the excitation light source 613 is turned on, the first laser light source 615 and the second laser light source 616 are turned off, the excitation light is guided to the fluorescence region 614b, the fluorescence region 614b generates fluorescence according to a portion of the excitation light and provides the fluorescence and another portion of the excitation light to the first light splitting element 618a through the light splitting and combining element 617c, and the first light splitting element 618a splits the excitation light and the fluorescence, so as to guide the first color light of the fluorescence to the first spatial light modulator through the guiding element 618c and guide the second color light 631 of the excitation light and the fluorescence to the second light splitting element. The second light splitting element 618b further splits the excitation light from the second color light of the fluorescent light, and supplies the second color light of the fluorescent light to the second spatial light modulator 632, and supplies the excitation light to the third spatial light modulator 633 via the guiding element 618 c.

Compared with the prior art, in the display device 600 of the present invention, since the second light is added, and the original image data of the image is further converted into m + n correction control signal values respectively corresponding to the first light and the second light, and then the first light and the second light are respectively modulated according to the m + n second correction control signal values, the first image light and the second image light can be obtained, the display of the image data with a wide color gamut can be realized, the accurate reduction of the display image can be ensured, and the display device 600 has a wider color gamut and a better display effect. In addition, the three spatial light modulators modulate light in different wavelength ranges, and the three spatial light modulators can work simultaneously, so that the image modulation time is reduced, the three spatial light modulators can work in a wavelength light splitting mode, and the display equipment is relatively practical.

Further, when calculating the correction control signal values r, g, b, rl, gl, by making the rl take²+gl²The minimum r, g, b, rl and gl data values can reduce the usage of the red laser and the green laser corresponding to rl and gl, thereby reducing the cost of the light source. Further, for the display device 600 according to the present invention, the color gamut of the REC2020 can be achieved by adding a small amount of red and green laser light. Referring to fig. 13, fig. 13 is a schematic diagram of the technical color gamut and color volume expansion of the display device shown in fig. 6. As shown in fig. 13, by adding green laser light and red laser light with 5% brightness, the color gamut can be expanded to the range of rec.2020, wherein the peripheral shaded area shown in fig. 13 is the expanded color gamut range, and therefore the display device 600 and the display device adopting the display method have better display effect.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A display device, characterized in that the display device comprises:

2. The display device of claim 1, wherein: the main wavelength ranges of the first color light, the second color light and the third color light are not overlapped with each other.

3. The display device of claim 1, wherein: further comprising an image data processing module for receiving an original image signal of a display image and outputting correction control signal values for the first and second lights based on an image gamut range.

4. The display device of claim 3, wherein: the correction control signal values include a correction control signal value of a first color light corresponding to the first light, a correction control signal value of a second color light corresponding to the first light, a control signal value of a third color light corresponding to the first light, a correction control signal value of a first color light corresponding to the second light, and a correction control signal value of a second color light corresponding to the second light.

5. The display device of claim 1, wherein: the first time period t1 is less than the second time period t 2.

6. The display device of claim 1, wherein: the first light source comprises an excitation light source and a wavelength conversion device, the excitation light source emits excitation light, the wavelength conversion device is provided with a fluorescent material and is used for receiving the excitation light and emitting fluorescence, the first light comprises fluorescence, the second light source comprises a laser light source, and the second light comprises laser.

7. The display device of claim 6, wherein: the excitation light source is a laser light source, the excitation light is blue laser, the wavelength conversion device is used for receiving the excitation light and converting one part of the excitation light into the fluorescence, and taking the other part of the excitation light and the fluorescence as the first light, the other part of the excitation light is third color light of the first light, the fluorescence comprises red light and green light, the red light of the fluorescence is the first color light of the first light, and the green light of the fluorescence is the second color light of the first light; the second light source comprises a red laser light source and a green laser light source, the second light comprises a red laser and a green laser, the red laser is a first color light of the second light, and the green laser is a second color light of the second light.

8. The display device of claim 7, wherein: the wavelength conversion device comprises a fluorescent region and a scattering region, wherein the fluorescent region and the scattering region are provided with fluorescent materials and are arranged along the circumferential direction, the scattering region receives the exciting light, the red laser and the green laser in a first period and scatters the exciting light, the red laser and the green laser to emit light, the fluorescent region receives the exciting light in a second period and converts a first part of light in the exciting light into the fluorescent light and emits a second part of light in the exciting light and the fluorescent light, and the exciting light in the first period and the second part of light in the second period are jointly used as third color light of the first light.

9. The display device of claim 8, wherein: the display apparatus further includes a first light splitting element that receives the first light and the second light emitted from the light source device and splits the first color light and the second color light and the third color light, the first color light being directed to the first spatial light modulator, the second color light and the third color light being directed to the second light splitting element; the second light splitting element directs the second color light to the second spatial light modulator and directs the third color light to the third spatial light modulator.

10. The display device of claim 8, wherein: the light source device further comprises a first light combining element, a second light combining element and a light splitting and combining element, wherein the first light combining element combines the excitation light emitted by the excitation light source with one of the red laser and the green laser, the second light combining element is used for combining the light emitted by the first light combining element with the other one of the red laser and the green laser and guiding the combined excitation light, the red laser and the green laser to the wavelength conversion device through the light splitting and combining element, and the first light and the second light emitted by the wavelength conversion device are further provided to the spatial light modulator through the light splitting and combining element.